Needleless liquid medicine injection device

Abstract

The present invention relates to a needleless liquid medicine injection device allowing repeated injections of liquid medicine into the skin, and high-pressure discharge of the liquid medicine, accommodated in a liquid medicine chamber, using a single coil.

Description

Needleless drug injection device

[0001] The present invention relates to a needleless drug injection device.

[0002] As human life expectancy increases, interest in health and skin care is exploding in order to sustain a happy life. Consequently, devices with skin care treatments utilizing various energy sources such as lasers, ultrasound, and radio frequency (RF)—which incorporate related technologies—are becoming known and widely applied in the market, and numerous companies are currently actively conducting research on this topic. These technologies generate heat by supplying energy to the skin and causing the movement of molecules constituting the skin tissue. By raising the internal temperature of the skin through this heat, the collagen layer is intentionally reorganized, thereby enabling the achievement of cosmetic treatment effects such as improved skin elasticity and wrinkle reduction.

[0003] Recently, research and development on needleless syringes has been active in order to alleviate the fear of syringe needles and prevent primary and secondary infections caused by needles.

[0004] However, conventional needleless syringes are manual and designed to inject a predetermined amount of medication into only one spot on the skin at a time, which can cause damage to skin tissue.

[0005] In addition, conventional needleless syringes had the problem of being difficult to repeatedly inject medication into the skin because they involved inconveniences such as reloading after injecting medication into the skin once.

[0006] The present invention has been devised to solve the aforementioned problems, and the objective of the present invention is to provide a needleless drug injection device capable of repeatedly injecting a drug into the skin.

[0007] Another objective of the present invention is to provide a needleless drug injection device capable of discharging a drug solution contained in a drug solution chamber at high pressure using a single coil.

[0008] The problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description below.

[0009] A needleless liquid injection device according to one embodiment of the present invention comprises: a liquid chamber in which a liquid is received; an elastic membrane having elasticity that separates the liquid chamber and the housing; a coil installed in the housing and generating magnetic force when current is applied; a movable magnetic body positioned in the housing at a distance from the elastic membrane and moving in a first direction toward the elastic membrane by the magnetic force generated by the coil; a fixed magnetic body fixed between the movable magnetic body and the elastic membrane and forming a magnetic force that pulls the movable magnetic body in the first direction by the magnetic force generated by the coil; a striking part that moves in the first direction by the movable magnetic body and strikes the elastic membrane to induce discharge of the liquid received in the liquid chamber; and a return elastic member installed in the housing and generating an elastic force that moves the movable magnetic body in a second direction opposite to the first direction.

[0010] In addition, it may further include a movable arm that combines the striking part and the movable magnetic body.

[0011] In addition, the above-mentioned moving arm may be made of a non-magnetic material.

[0012] In addition, the fixed magnetic body may have a fastening portion formed therein that guides the movement of the movable arm by allowing the movable arm to pass through it.

[0013] In addition, the solekoid coil can be arranged along the circumference of the moving magnetic body and the stationary magnetic body.

[0014] In addition, the striking part may further include a stopper that limits the range of movement in a second direction away from the elastic membrane.

[0015] Additionally, the stopper may include a striking part fixing part that is screw-coupled to the moving arm so as to be movable in the first direction or the second direction; and a shock absorbing part installed between the striking part fixing part and the fixed magnetic body in the moving arm, which absorbs the shock applied by the striking part fixing part to the fixed magnetic body when the striking part moves in the second direction and returns.

[0016] Additionally, it may further include a striking part movement space formed in the liquid medicine chamber and in contact with the elastic membrane, providing a movement path for the striking part to move toward the elastic membrane; and a striking part gap adjustment part that adjusts the gap between the elastic membrane and the striking part so as to adjust the size of the movement path. Additionally, one side of the striking part gap adjustment part is coupled to the liquid medicine chamber and the other side is inserted into the housing, and the gap between the elastic membrane and the striking part can be adjusted according to the depth at which the other side of the striking part gap adjustment part is inserted into the housing.

[0017] Additionally, the movable arm may include a first arm coupled to the striking part and penetrating the fastening part; and a second arm that combines the first arm with the movable magnetic body.

[0018] Other specific details of the present invention are included in the detailed description and drawings.

[0019] A needleless drug injection device according to one embodiment of the present invention has the effect of being able to repeatedly inject a drug into the skin.

[0020] In addition, the needleless drug injection device according to one embodiment of the present invention has the effect of being able to discharge the drug contained in the drug chamber at high pressure using a single coil.

[0021] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by a person skilled in the art from the description below.

[0022] FIG. 1 is a block diagram showing a needleless drug injection device according to one embodiment of the present invention.

[0023] FIG. 2 is a perspective view showing a needleless drug injection device according to one embodiment of the present invention.

[0024] FIG. 3 is a cross-sectional view showing a needleless drug injection device according to one embodiment of the present invention.

[0025] FIG. 4 is an exploded perspective view showing a needleless drug injection device according to one embodiment of the present invention.

[0026] FIGS. 5a to 5c are exploded cross-sectional views showing various examples of a needleless liquid injection device according to one embodiment of the present invention.

[0027] FIGS. 6 and 7 are perspective views showing the operation process of a needleless drug injection device according to one embodiment of the present invention.

[0028] FIG. 8 is a perspective view showing a heat dissipation member of a needleless liquid injection device according to one embodiment of the present invention.

[0029] FIG. 9 is a cross-sectional view showing an example of a state in which the gap between the elastic membrane and the striking part of a needleless liquid injection device according to one embodiment of the present invention is adjusted.

[0030] FIG. 10 is a cross-sectional view showing another example of a state in which the gap between the elastic membrane and the striking part of a needleless liquid injection device according to one embodiment of the present invention is adjusted.

[0031] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the present invention, and the present invention is defined only by the scope of the claims.

[0032] The terms used herein are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise.

[0033] Unless otherwise defined, all terms used herein (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0034] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0035] FIG. 1 is a block diagram showing a needleless drug injection device according to one embodiment of the present invention.

[0036] As illustrated in FIG. 1, a needleless liquid injection device according to one embodiment of the present invention may include a liquid injection part (100), a driving part (200), a display part (300), a switch part (400), a processor (500), a memory part (600), and a power part (700).

[0037] The liquid injection part (100) can perform the role of spraying the liquid by the driving force of the driving part (200).

[0038] The driving part (200) can serve to provide the driving force for the liquid injection part (100) to spray the liquid.

[0039] The display part (300) may be a display that displays the operating status of the liquid injection part (100) and the driving part (200).

[0040] The switch part (400) can select functions and conditions for operating the driving part (200) and control the driving part (200). Here, the functions and conditions for operating the driving part (200) may include the injection time and number of injections of the liquid sprayed from the liquid spraying part (100) by the driving force of the driving part (200), and various other functions and conditions may also be applied.

[0041] The processor (500) can control the switch part (400). This processor (500) may include an interface for receiving functions and conditions for operating the drive part (200).

[0042] The memory part (600) can store the operating status of the liquid injection part (100) and the driving part (200) displayed on the display part (300).

[0043] The power part (700) can serve to apply current to the driving part (200) under the control of the processor (500).

[0044] FIG. 2 is a perspective view showing a needleless liquid injection device according to one embodiment of the present invention, FIG. 3 is a cross-sectional view showing a needleless liquid injection device according to one embodiment of the present invention, FIG. 4 is an exploded perspective view showing a needleless liquid injection device according to one embodiment of the present invention, and FIG. 5a to 5c are exploded cross-sectional views showing various examples of a needleless liquid injection device according to one embodiment of the present invention.

[0045] For reference, FIGS. 2 to 5c illustrate a liquid injection part (100) and a driving part (200) of a needleless liquid injection device according to one embodiment of the present invention.

[0046] The liquid injection part (100) may include a liquid chamber (110), an elastic membrane (130), a liquid injection port (140), an input check valve (150), a liquid transfer pipe (160), an output check valve (170), and a restoring elastic member (180).

[0047] The liquid medicine chamber (110) is the basic body of the liquid medicine injection part (100) and can contain liquid medicine. The drug contained in the liquid medicine chamber (110) can be discharged through the liquid medicine transfer pipe (160) when the liquid medicine chamber (110) is pressurized according to the contraction deformation of the elastic membrane (130). At this time, the elastic membrane (130) can contract and deform in the direction of the liquid medicine chamber (110) by the impact of the striking part (252), thereby pressurizing the liquid medicine chamber (110). Meanwhile, one side of the liquid medicine chamber (110) can be connected to the liquid medicine injection port (140), and the other side of the liquid medicine chamber (110) can be connected to the liquid medicine transfer pipe (160).

[0048] The elastic membrane (130) separates the liquid medicine chamber (110) and the housing (210) and may have elasticity. For example, the elastic membrane (130) may be placed inside the liquid medicine chamber (110) to pressurize the liquid medicine chamber (110). Meanwhile, the elastic membrane (130) may be secured by a sealing member (192) that prevents liquid medicine from leaking between it and the liquid medicine chamber (110). Additionally, a striking part movement space (194) in which a striking part (252) moves may be formed inside the liquid medicine chamber (110). The striking part movement space (194) is formed in the liquid medicine chamber (110) and contacts the elastic membrane (130), and may provide a movement path for the striking part (252) to move toward the elastic membrane (130).

[0049] The sealing member (192) is installed in the liquid medicine chamber (110), seals the space between the liquid medicine chamber (110) and the elastic membrane (130), and can surround the impact part movement space (194).

[0050] For example, the sealing member (192) may have a round (192b) formed as the inner surface facing the elastic membrane (130) is chamfered. Accordingly, when the elastic membrane (130) shrinks and deforms toward the sealing member (192), damage to the elastic membrane (130) can be prevented by the round (192b) of the sealing member (192).

[0051] For example, an O-ring (196) for sealing may be installed between the outer circumference of the elastic membrane (130) and the inner circumference of the liquid chamber (110).

[0052] The drug injection port (140) is connected to the drug chamber (110) and can serve to inject the drug into the drug chamber (110). The drug injection port (140) can receive the drug from the drug supply part (800). For example, the drug supply part (800) may include a syringe containing the drug that is detachably coupled to the drug injection port (140). For another example, the drug supply part (800) may include a disposable drug container connected to the drug injection port (140) and supplying the drug.

[0053] An input check valve (150) is installed in the liquid injection port (140) within the liquid chamber (110) and can serve to open and close the liquid injection port (140). This input check valve (150) can be opened by the negative pressure formed in the liquid chamber (110) when the liquid is discharged from the liquid chamber (110). Specifically, negative pressure formed in the liquid medicine chamber (110) can be formed as the volume of the liquid medicine chamber (110) decreases as the elastic membrane (130), which is pressurized by the striking part (252), protrudes toward the liquid medicine chamber (110) and pressurizes the liquid medicine chamber (110) to spray the liquid medicine, thereby forming positive pressure in the liquid medicine chamber (110), and as the volume of the liquid medicine chamber (110) increases as the elastic membrane (130) is restored to its original shape by the elastic force of the restoring elastic member (180), negative pressure can be formed in the liquid medicine chamber (110).

[0054] The liquid transfer pipe (160) is connected to the nozzle (161) of the liquid chamber (110) and is formed to allow the liquid to be sprayed through the nozzle (161) so as to discharge the liquid contained in the liquid chamber (110). A nozzle (161) for spraying the liquid may be installed on one side of the liquid transfer pipe (160).

[0055] An output check valve (170) is installed on one side of the liquid transfer pipe (160), and when the output check valve (170) is opened or closed by the reciprocating motion of the moving magnetic body (230), the liquid sprayed through the liquid transfer pipe (160) and the nozzle (161) can be controlled. This output check valve (170) can be opened by the positive pressure formed in the liquid chamber (110) when the liquid chamber (110) of the elastic membrane (130) is pressurized. At this time, the positive pressure formed in the liquid chamber (110) can be sprayed by the positive pressure formed in the liquid chamber (110) as the volume of the liquid chamber (110) decreases when the elastic membrane (130), which is pressurized by the striking part (252), pressurizes the liquid chamber (110). For example, the output check valve (170) may be omitted. In this case, it is possible to prevent vortices from forming in the liquid discharged into the liquid transfer pipe (160).

[0056] The restoring elastic member (180) can serve to restore the elastic membrane (130), which is pressed by the striking part (252), to its original state.

[0057] The driving part (200) may include a housing (210), a coil (220), a moving magnetic body (230), a stationary magnetic body (240), and a striking part (252).

[0058] The housing (210) serves as the basic body of the driving part (200) and can be detachably coupled to the liquid chamber (110). Inside this housing (210), a coil (220), a moving magnetic body (230), a stationary magnetic body (240), and a striking part (252) may be housed. For example, the housing (210) may have a cylindrical shape.

[0059] The coil (220) is installed in the housing (210) and can generate magnetic force when current is applied. Here, the current applied to the coil (220) can be applied from the power supply part (700).

[0060] For example, a coil (220) may be placed along the circumference of a movable magnetic body (230) and connected to a fixed magnetic body (240). Here, the movable magnetic body (230) may be placed inside the coil (220), and the fixed magnetic body (240) may be connected to the coil (220) while fixed between the movable magnetic body (230) and the elastic film (130). Thus, the movable magnetic body (230) moves in a first direction by the magnetic force generated in the coil (220). At this time, due to the magnetic force generated by the coil (220), one side (= first direction side) of the movable magnetic body (230) can become an S pole and the other side (= second direction side) of the movable magnetic body (230) can become an N pole, and one side (= first direction side) of the fixed magnetic body (240) can become an S pole and the other side (= second direction side) of the fixed magnetic body (240) can become an N pole. As a result, the S pole formed on the first direction side (= first direction side) of the movable magnetic body (230) can be pulled by the N pole formed on the other side (= second direction side) of the fixed magnetic body (240). Consequently, the movable magnetic body (230) can move rapidly in the first direction by the magnetic force generated by the coil (220) and the magnetic force pulling from the fixed magnetic body (240). For example, the first direction may be a direction in which the moving magnetic body (230) moves closer to the fixed magnetic body (240), and the second direction may be a direction in which the moving magnetic body (230) moves away from the fixed magnetic body (240). As another example, the first direction may be a direction in which the moving magnetic body (230) moves closer to the elastic film (130), and the second direction may be a direction in which the moving magnetic body (230) moves away from the elastic film (130).

[0061] The movable magnetic body (230) is positioned in the housing (210) at a distance from the elastic membrane (130) and can move in a first direction toward the elastic membrane (130) by the magnetic force generated by the coil (220). Additionally, the movable magnetic body (230) can move in a second direction opposite to the first direction. For example, when the magnetic force generated by the coil (220) is released, the movable magnetic body (230) can move in the second direction by the elastic force generated by the return elastic member (280).

[0062] The fixed magnetic body (240) is fixed between the movable magnetic body (230) and the elastic membrane (130), and can form a magnetic force that pulls the movable magnetic body (230) in a first direction by the magnetic force generated from the coil (220).

[0063] For example, a fixed magnetic body (240) may have a connecting part (241) formed by a movable arm (231) penetrating it to guide the movable arm (231). Accordingly, the movable arm (231) may move in a first direction or a second direction along the connecting part (241).

[0064] The striking part (252) is coupled to the movable magnetic body (230) via the movable arm (231) and penetrates the fixed magnetic body (240), and can move in a first direction together with the movable magnetic body (230) to press the elastic membrane (130) and induce the discharge of the liquid medicine contained in the liquid medicine chamber (110). The striking part (252) can be coupled to the movable magnetic body (230) via the movable arm (231). For example, the striking part (252) is positioned at a distance from the elastic membrane (130), and the striking part (252) can move in a first direction approaching the elastic membrane (130) to strike and press the elastic membrane (130).

[0065] The striking portion (252) may be positioned between the elastic membrane (130) and the movable arm (231) and may be connected to the movable arm (231). This striking portion (252) may have a diameter corresponding to that of the elastic membrane (130). Accordingly, the elastic membrane (130) may protrude over a large area toward the liquid medicine chamber (110) when pressurized by the striking portion (252).

[0066] For example, the striking part (252) may have a larger diameter than the moving arm (231).

[0067] Referring to FIGS. 5a through 5c, the movable arm (231) can combine the striking part (252) and the movable magnetic body (230). This movable arm (231) can be made of a non-magnetic material. Therefore, since the movable arm (231) is not affected by the magnetic force generated from the solenoid coil (220), the magnetic force generated from the fixed magnetic body (240) does not affect the movement of the movable arm (231).

[0068] For example, referring to FIG. 5a, the movable arm (231) itself can be coupled with the movable magnetic body (230). In this case, the front of the movable magnetic body (230) may have a tapered shape; for example, the tapered shape of the front of the movable magnetic body (230) may have a shape in which the diameter gradually decreases as it approaches the movable arm (231). This tapered shape of the front of the movable magnetic body (230) may be easily inserted into the part formed at an angle on the rear of the fastening part (241). For another example, referring to FIG. 5b, the movable arm (231) itself can be coupled with the movable magnetic body (230). In this case, the rear of the movable arm (231) may have a tapered shape; for example, the tapered shape of the rear of the movable arm (231) may have a shape in which the diameter gradually increases as it approaches the movable magnetic body (230). The tapered shape at the rear of this movable arm (231) can be easily inserted into the portion formed at an angle at the rear of the fastening part (241).

[0069] As another example, referring to FIG. 5c, the movable arm (231) may include a first arm (231a) and a second arm (231b). The first arm (231a) may be coupled to the striking portion (252) and penetrate the fastening portion (241). The second arm (231b) may be coupled to the first arm (231a) and the movable magnetic body (230). In this case, the second arm (231b) may have a tapered shape; for example, the second arm (231b) may have a shape in which the diameter gradually increases as it approaches the movable magnetic body (230). Such a second arm (231b) may be easily inserted into a portion formed at an angle at the rear of the fastening portion (241). Here, the first arm (231a) may be detachably screw-coupled to the second arm (231b). Additionally, the second arm (231b) can be detachably screw-coupled to the moving magnetic body (230).

[0070] The driving part (200) may further include a stopper (260), a striking part gap adjustment part (270), and a return elastic member (280).

[0071] The stopper (260) may serve to limit the range of movement of the striking part (252) in the second direction. The stopper (260) may include a striking part fixing part (261) and a shock absorbing part (262).

[0072] The striking part fixing part (261) can be screw-coupled to the moving arm (231) so as to be movable in a first direction or a second direction opposite to the first direction.

[0073] The shock absorber (262) is installed between the striking part fixing part (261) and the fixed magnetic body (240) in the moving arm (231), and can serve to absorb the shock applied by the striking part fixing part (261) to the fixed magnetic body (240) when the striking part (252) moves in the second direction and returns. Additionally, the shock absorber (262) can serve to absorb the shock applied by the striking part fixing part (261) to the fixed magnetic body (240) when the striking part (252) moves in the second direction and returns due to the recoil from the striking of the striking part (252) hitting the elastic membrane (130).

[0074] The striking part gap adjustment part (270) can adjust the gap between the elastic membrane (130) and the striking part (252) so that the size of the movement path of the striking part (252) moving toward the elastic membrane (130) in the striking part movement space (194) is adjusted.

[0075] For example, one side of the impact part gap adjustment part (270) may be connected to the liquid medicine chamber (110) and the other side may be inserted into the housing (210). Thus, the gap between the elastic membrane (130) and the impact part (252) can be adjusted according to the depth at which the other side of the impact part gap adjustment part (270) is inserted into the housing (210).

[0076] The return elastic member (280) is installed in the housing (210) and can generate an elastic force that moves the movable magnetic body (230) in a second direction. As a result, the movable magnetic body (230) can be returned to its initial position by the elastic force of the return elastic member (280).

[0077] For example, one side of the return elastic member (280) (= first direction side) may be supported by the coil (220), and the other side (= second direction side) may be coupled to the outer circumference of the movable magnetic body (230). Accordingly, the return elastic member (280) may be compressed when the movable magnetic body (230) moves in the first direction, and then an elastic force may be generated to return the movable magnetic body (230) to the second direction by means of an elastic restoring force.

[0078] The operation process of a needleless liquid injection device according to one embodiment of the present invention will be described below. The following process may proceed automatically under the control of a processor (500).

[0079] FIGS. 6 and 7 are perspective views showing the operation process of a needleless drug injection device according to one embodiment of the present invention.

[0080] First, the power part (700) applies power to the coil (220). As a result, magnetic force is generated in the coil (220).

[0081] Subsequently, a magnetic field is formed in the movable magnetic body (230) and the fixed magnetic body (240) placed inside the coil (220) by the magnetic force generated in the coil (220). The magnetic field thus formed creates magnetism of different polarities in the movable magnetic body (230) and the fixed magnetic body (240), which are physically separated from each other. As a result, as magnetism of different polarities is formed in the movable magnetic body (230) and the fixed magnetic body (240), an attractive force is formed in which the fixed magnetic body (240) strongly pulls the movable magnetic body (230), and as a result, the movable magnetic body (230) moves forward (= moves in the first direction) until it collides with the fixed magnetic body (240). In this way, as the movable magnetic body (230) moves forward rapidly and collides with the fixed magnetic body (240) and then stops, a strong impact force can be provided to the front of the movable magnetic body (230). (See Fig. 6)

[0082] Next, as the striking part (252) strikes and pressurizes the elastic membrane (130) in conjunction with the forward movement (=first direction movement) of the moving magnetic body (230), the volume of the liquid medicine chamber (110) decreases due to the contraction deformation of the elastic membrane (130), and positive pressure is formed in the liquid medicine chamber (110). As a result, the output check valve (170) opens, and the drug contained in the liquid medicine chamber (110) can be discharged to the skin or into the skin through the liquid medicine transfer pipe (160) and the nozzle (161). (See FIG. 7)

[0083] Subsequently, the power supplied from the power part (700) to the coil (220) is released. As a result, the elastic membrane (130) is restored to its original shape by the elastic force of the restoring elastic member (180), and the moving magnetic body (230) can be returned to its initial position by moving backward (moving in the second direction) by the elastic force of the return elastic member (280). At this time, the volume of the liquid medicine chamber (110) increases, and negative pressure is formed in the liquid medicine chamber (110). Accordingly, the output check valve (170) is closed, and the input check valve (150) is opened, so that the liquid medicine is injected into the liquid medicine chamber (110) from the liquid medicine injection port (140).

[0084] Afterwards, the above processes can be repeated to repeatedly inject the medication into the skin.

[0085] FIG. 8 is a perspective view showing a heat dissipation member of a needleless liquid injection device according to one embodiment of the present invention.

[0086] As shown in FIG. 8, the driving part (200) may further include a heat dissipation member (290).

[0087] The heat dissipation member (290) can be interposed between the solenoid coil (220) and the housing (210) and can absorb heat generated from the solenoid coil (220) and dissipate heat.

[0088] For example, a thermal interface material may be applied to the inner and outer surfaces of the heat dissipation member (290) to improve the heat transfer efficiency between the solenoid coil (220) and the heat dissipation member (290) and the heat transfer efficiency between the heat dissipation member (290) and the housing (210). For example, the thermal interface material may include at least one of grease and carbon nanotubes, but the present invention is not limited thereto, and the thermal interface material may be applied to other materials.

[0089] As another example, a plurality of grooves (291) may be formed on the outer surface of the heat dissipation member (290) to improve heat dissipation efficiency.

[0090] FIG. 8 is a cross-sectional view showing an example of a state in which the gap between the elastic membrane and the striking part of a needleless liquid injection device according to one embodiment of the present invention is adjusted.

[0091] Referring to FIG. 8, the gap between the elastic membrane (130) and the striking part (252) can be adjusted according to the depth at which the other side of the striking part gap adjustment part (270) is inserted into the housing (210).

[0092] Accordingly, the greater the depth at which the other side of the impact part gap adjustment part (270) is inserted into the housing (210), the smaller the gap between the elastic membrane (130) and the impact part (252) can be, and as a result, as the movement path through which the elastic part (252) can move toward the elastic membrane (130) becomes shorter, the impact force of the elastic part (252) striking the elastic membrane (130) can be reduced.

[0093] Additionally, as the depth at which the other side of the impact part gap adjustment part (270) is inserted into the housing (210) decreases, the gap between the elastic membrane (130) and the impact part (252) can be increased, and as a result, as the movement path that the elastic part (252) can move toward the elastic membrane (130) becomes longer, the impact force of the elastic part (252) striking the elastic membrane (130) can be increased.

[0094] FIG. 9 is a cross-sectional view showing another example of a state in which the gap between the elastic membrane and the striking part of a needleless liquid injection device according to one embodiment of the present invention is adjusted.

[0095] As shown in FIG. 9, the striking part (252) can have a moving arm (231) inserted into it and can be screw-coupled with the moving arm (231).

[0096] Accordingly, the greater the depth to which the moving arm (231) is inserted into the striking part (252), the smaller the gap between the elastic membrane (130) and the striking part (252) can be, and as a result, the movement path through which the striking part (252) can move toward the elastic membrane (130) becomes shorter, and thus the force of the impact of the striking part (252) striking the elastic membrane (130) can be reduced.

[0097] Additionally, as the depth to which the moving arm (231) is inserted into the striking part (252) decreases, the gap between the elastic membrane (130) and the striking part (252) can be increased, and as a result, as the movement path through which the striking part (252) can move toward the elastic membrane (130) becomes longer, the force of the impact of the striking part (252) striking the elastic membrane (130) can be increased.

[0098] For example, the depth direction width of the liquid medicine chamber (110) may be smaller than the diameter of the elastic membrane (130). Here, the depth direction of the liquid medicine chamber (110) may be the direction in which the elastic membrane (130), struck by the striking part (252), contracts and deforms toward the liquid medicine chamber (110).

[0099] In this way, since the depth direction width of the liquid medicine chamber (110) is smaller than the diameter of the elastic membrane (130), when the elastic membrane (130) struck by the striking part (252) contracts and deforms toward the liquid medicine chamber (110), the contraction deformation width of the elastic membrane (130) is limited to the depth direction width of the liquid medicine chamber (110) which is smaller than the diameter of the elastic membrane (130), so that the elastic membrane (130) can be prevented from protruding excessively toward the liquid medicine chamber (110).

[0100] According to the present disclosure, when power is applied from the power supply part (700) to the driving part (200), magnetic force is generated in the coil (220) that generates magnetic force according to Fleming's left-hand rule, and the moving magnetic body (230) moves toward the fixed magnetic body (240) coupled to the coil fixing part (120). When it approaches one end of the fixed magnetic body (240), opposite magnetic poles are formed, and a moving arm (231) composed of a non-magnetic material is coupled to one side of the moving magnetic body (230) by a strong pulling force, and the moving arm (231) moves rapidly to the striking part moving space (194). At this time, the striking part (252) connected to one side of the moving arm (231) strikes the elastic membrane (130) equipped in the liquid spraying part (100). At this time, the elastic membrane (130) that is struck and the elastic membrane (130) that is overlapping are also struck simultaneously, causing the volume of the liquid medicine chamber (110) to shrink, the output check valve (170) to open and the input check valve (150) to close, so that the liquid medicine contained in the liquid medicine chamber (110) moves through the liquid medicine transfer pipe (160) and is sprayed by the nozzle (161) provided at one end of the liquid medicine chamber (110). The nozzle (161) can be a detachable and replaceable type or an integrated type depending on the designer's choice. After the liquid medicine is ejected in this way, the elastic membrane (130) moves back to its original position by the restoring force of the restoring elastic member (180). As the pressure of the liquid medicine chamber (110) expands due to this movement, the output check valve (170) is closed and the input check valve (150) is opened, so that the liquid medicine is injected into the liquid medicine chamber (110) through the liquid medicine injection port (140). Then, after the driving part (200) strikes the elastic membrane (130), the power of the power part (700) is turned off, and at this time, the moving magnetic body (230) is quickly moved backward by the return elastic member (280) and moves to the original position.When the movable magnetic body (230) moves backward, the movable arm (231) and the striking part (252) coupled to the movable magnetic body (230) also move backward. At this time, a shock absorbing part (262) may be provided to weaken the impact applied to the fixed magnetic body (240). When the power part (700) applies power again to the movable magnetic body (230) that has moved backward in this way, it operates in the same sequence as above.

[0101] According to the present disclosure, the driving part (200) can be driven repeatedly at least once per second according to the principle described above, and can be driven repeatedly dozens of times per second depending on the user's selection, thereby injecting a liquid medicine into the skin without a needle. In the present invention, the preferred number of times is set to 25 times per second.

[0102] According to the present disclosure, the liquid injection part (100) may include a liquid chamber (110), a nozzle (161), a liquid transfer pipe (160), an output check valve (170), a restoring elastic member (180), a liquid injection port (140), an elastic membrane (130), and a striking part movement space (194).

[0103] According to the present disclosure, the operation of the liquid injection part (100) has been described above, and the output check valve (170) and the input check valve (150) can be implemented in other forms if they perform the same function.

[0104] Additionally, the elastic membrane (130) can be implemented without the restoring elastic member (180), but preferably, it is advantageous to maintain a slightly convex state in the direction of the striking part movement space (194) of the striking part (252) by the elasticity of the restoring elastic member (180) so that the liquid is sprayed through the nozzle (161).

[0105] According to the present invention, a needleless drug injection device according to one embodiment of the present invention has the effect of being able to repeatedly inject a drug into the skin.

[0106] In addition, the needleless drug injection device according to one embodiment of the present invention has the effect of being able to discharge the drug contained in the drug chamber at high pressure using a single coil.

[0107] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without altering its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive.

Claims

1. A drug solution chamber for receiving the drug solution; A housing detachably coupled to the above-mentioned liquid medicine chamber; Separating the above liquid medicine chamber and the above housing, and an elastic membrane having elasticity; A coil installed in the above housing and generating magnetic force when current is applied; A moving magnetic body disposed in the housing with a gap from the elastic membrane and moving in a first direction toward the elastic membrane by the magnetic force generated from the coil; A fixed magnetic body fixed between the movable magnetic body and the elastic membrane, and forming a magnetic force that pulls the movable magnetic body in the first direction by the magnetic force generated in the coil; A striking part that moves in the first direction by the moving magnetic body and strikes the elastic membrane to induce the discharge of the liquid medicine contained in the liquid medicine chamber; and A needleless liquid injection device comprising a return elastic member installed in the above housing, which generates an elastic force to move the moving magnetic body in a second direction opposite to the first direction.

2. In Paragraph 1, A needleless liquid injection device further comprising a movable arm that combines the striking part and the movable magnetic body.

3. In Paragraph 2, The above-mentioned movable arm is a needleless drug injection device made of a non-magnetic material.

4. In Paragraph 2, The above fixed magnetic body is, A needleless drug injection device in which the above-mentioned movable arm is penetrated and a fastening portion is formed to guide the movement of the above-mentioned movable arm.

5. In Paragraph 1, A needleless drug injection device in which the solecoid coil is arranged along the circumference of the moving magnetic body and connected to the stationary magnetic body.

6. In Paragraph 2, A needleless liquid injection device further comprising a stopper that limits the range of movement of the striking part in a second direction away from the elastic membrane.

7. In Paragraph 6, The above stopper is, A striking part fixing part screw-coupled to the above-mentioned movable arm so as to be movable in the first direction or the second direction; and A needleless liquid injection device comprising a shock absorber installed between the striking part fixing part and the fixed magnetic body in the above-mentioned moving arm, which absorbs the shock applied by the striking part fixing part to the fixed magnetic body when moving in the above-mentioned second direction of the striking part and returning.

8. In Paragraph 1, A striking part movement space formed in the above-mentioned liquid chamber and in contact with the above-mentioned elastic membrane, and providing a movement path in which the striking part moves toward the above-mentioned elastic membrane; and A needleless drug injection device further comprising a striking part spacing adjustment part that adjusts the spacing between the elastic membrane and the striking part so as to adjust the size of the above movement path.

9. In Paragraph 8, One side of the above-mentioned striking part gap adjustment unit is coupled to the above-mentioned liquid medicine chamber, and the other side is inserted into the above-mentioned housing, and A needleless drug injection device in which the gap between the elastic membrane and the striking part is adjusted according to the depth at which the other side of the striking part gap adjustment part is inserted into the housing.

10. In Paragraph 4, The above-mentioned movable arm is, A first arm coupled to the striking part and penetrating the fastening part; and A needleless drug injection device comprising a first arm and a second arm that combines the moving magnetic body.

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